70-oku no Hari7 Billion Needles - Tadano, Nobuaki

Accepting only the comfort of her headphones, high school student Hikaru Takabe spends her time isolated from her classmates. However, her life takes a new turn when she meets a powerful intergalactic being named Horizon. As a result of the surreal incident leading to their encounter, Horizon must stay within Hikaru’s body, much to her chagrin.

Now armed with Horizon's powers of spatial manipulation, Hikaru is dragged into the mission that brought it to Earth: to destroy Maelstrom, a lifeform whose instinctive purpose is to kill every living being on whatever planet it finds itself on. For Hikaru, this not only involves partaking in an evolutionary game of cat and mouse, but also taking the first steps out of her shell.

[Written by Animeranku Rewrite]
Included one-shot:
Volume 4: Hikikomori Headphone Girl (pilot)

70 Oku no Hari was inspired by the 1950 science-fiction novel Needle by Hal Clement.

The series was published in English as 7 Billion Needles by Vertical Inc. from September 28, 2010 to April 26, 2011, in Polish as 7 miliardów igieł by Japonica Polonica Fantastica in 2013 as part of Mega Manga series and in Spain as 7 mil millones de agujas by Milky Way Ediciones in 2016.